Manufacture of rubber filaments or threads



Patented Mar. 3, 1925. i

UNITED STATES PATENT OFFICE.

nun-imam, or conoeien, enmrnur. I

iuunrnc'runn or nunnnn. rrnmnurs on. rnnmns. No Drawing. Applicationfled August 16,1922. Serial No. 582,212.

.To all whom it may concern: 7 the sulphur should be deposited veryslowly Be it known that I, Max DRAEHANN, V in order that the filamentsor threads may citizen of Germany, residing at Cologne, be uniform alongtheir whole length both in Germany, have invented new and usefulImregard of tearing-strength and ductility. provements in or Relating tothe Manufac- This may be obtained by cooling the second ture of RubberFilaments or Threads, of gas, for example, in the case of sulphur whichthe following is a specification. dioxide a solution with benzinecooled. down It has already been proposed to'vulca-nize to about 5 to 10C. may be employed; or

a caoutchouc solution in .a cold state with the gas may be compresseduntil it is lique- 10 the aid of sulphurete'd hydrogen and Sulphur fied.The reaction of the two gases on the 60 dioxide by adding both gasesconsecutively filaments or threads is then caused to take to thecaoutchouc after its solution in benplace in a retarded manner.

zine. In this manner it is possible to vul- 'It has moreover beenfoundthat with the canize larger; caoutchouc articles but the aid of-thenovel process individual filaments method above referred to is notsuitable for 01" threads immediately after their exit from 6 themanufacture of thin rubber threads for the nozzles may be cordedtogether shortly the reason, that at the moment in which the before,during or after the treatment with normal vulcanization is reached acontracthe second gas. The contraction of the subtion occurs, and it isthen no longer possible stance forming the filaments or threads toobtain smooth rubber filaments or threads which takes place'after thismanipulation 70 of'round cross section by squeezing the rubresults in asufiicient strength to enable the her solution from the squirtingmachine. filaments, 01' threads to be subjected to According to thepresent invention the further treatment. It is preferable to operabovedrawback 1S avolded by first treating ate with very liquid solutionswhereas the rubber solution with one of the vulcaniz'- generallyspeaking for manufacturing rub- 7 ing gases, then moulding the filamentsor her threads only thick or viscous sothreads to the action of thesecond vulcanizlutions can be employed, because the unvuling gas. In'this manner rubber filaments or canized threads would at oncedeliquat'e. threads of any desired length may be pro- By using highlyliquid solutions the pressure duced by performing the moulding stage onthe caoutchouc mass may be considerably so between the reaction of thetwo complimenreduced ,or avoided. The advantage of tar vulcanizinggases. It is therefore poscording resides in a greater strength of thesib e according to the novel'process to treat filaments or threadsproduced.

the caoutchouc solutiou'for example first Having now particularlydescribed .and

with sulphur-eted hydrogen or sulphur di ascertained the nature of mysaid invens5 oxide or some other vulcanizing gas, then to tion and inwhat manner the same is to be form from this gas-contained solutionfilaperformed, I declare that what I claim is:

ments or threads and finally to introduce the 1 A th d f th manufacturef blatter directll after their formation 31 her filaments which consistsin subjecting a 40 solution containing the 00m% y'g rubber solution tothe action of one of two for E l sulphur-formation; y PP P complementaryvulcanizing gases, forming mampulatlon (hssolvmg means 5 the treatedsolution into thread-like filapelled whereupon the filaments or, threads'ments, and passing said filaments through are reeled P and ready forfurther A a solution containingthe other complemenm thls p ,1 s aboutfiwto fioo-metres- 2. A method for the manufacture of rub- Since, in thecase of rubber threads only her filaments which consists in subjecting avery smallcross sections come into question, rubber solution to theaction of cooled sulit is desirable to perform the operationslowphureted hydrogen, forming the treated soly. It is likewise of greatimportance that lutioninto thread-like filaments, and then 1 I racticallength. for the filaments or threads t as a masses s'ubjectin' said"filaments to'i-the action of: jecting said rfilaments to the action ofsul'-. sulphur ioxide. phur dioxide and cording the individual'fila 3. Amethod for the manufacture of rubments togetherby means of a highlyliquid,

ber filaments 'which consists in subjectin rubber solution.

a rubber solution to the action of coole In testimony whereof I havesigned my' sulphureted h dro en, forming the treated name to thisspecification solution into ea -like filaments, then sub- DRAETIANN.

